I was just reading where Edmonton's first drive-in restaurant was opened in time for the 1939 Royal Visit.
I then wondered when The White Spot started doing Drive-Ins. Answer: 1928.
I knew they started that early, but I had forgotten that they were doing Drive-Ins from the beginning.
As my Edmonton history book was mentioning, even 1939 was extremely early for Drive-Ins. A&W pretty much owned the (Edmonton) market at the beginning of the 1960s.
As American Graffiti showed, listening to the Radio was very popular at Drive-Ins.